Note 8 - Concentrations - Revenue by Geographic Region (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Revenue | $ 29,863,881 | $ 28,326,196 | $ 27,717,278 |
| UNITED STATES | |||
| Revenue | 14,911,258 | 13,600,236 | 12,392,053 |
| EMEA [Member] | |||
| Revenue | 10,133,134 | 9,612,883 | 11,392,046 |
| Asia Pacific [Member] | |||
| Revenue | 4,607,811 | 4,200,934 | 3,113,484 |
| Rest of World [Member] | |||
| Revenue | $ 211,678 | $ 912,143 | $ 819,695 |